feat: Floor division support in dynamic values

[avanwinkle]

This PR adds floor division functionality to dynamic values, useful for rounding arbitrary numbers to clean multiples.

For example, calculating a point score based on a timer count (hurryup) or a multiplier can yield tens and ones of digits, or even floats. Many pinball games like to have a minimum score multiple of 10 (e.g. no single-digit points) or even 100, and this PR enables a dynamic value to crop to the nearest iteration using the standard syntax of floor division * divisor.

variable_player:
  jackpot_shot_hit:
    score: current_player.jackpot_value * current_player.float_multiplier // 100 * 100

The placeholder templating engine uses native python operations so it inherently understands that // means floor division, but the code module wasn't mapping the op.floordiv method for executing it. This PR simply maps the method, and it works. Tests added to verify and prevent regressions.

[sonarcloud]

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[toomanybrians]

Awesome feature, and such a simple and powerful change to make! Thanks for the tests, and I'll add this to the docs.